THV3012 Datasheet, PDF (9/12 Pages) THine Electronics, Inc. – 1ch DC/DC converter

THV3012_Rev.1.00_E
● Setting the Output Voltage
THV3012 detects the output ripple voltage. When the output voltage reaches to the voltage defined
by R + R (between output capacitor and FB pin) and
2
3
R ₄ ( between FB pin and GND) as following
formula, LL pin is turned from Low to High level for a constant time.
V
OUT _ bottom
=
V
FB
×
⎜⎛
⎜⎝
1
+
R
2
+
R
3
⎟⎞
R
4
⎟⎠
DC output voltage at the continuous mode is calculated as following formula, adding the average of the ripple
voltage ( I
rip
×
R ).
ESR
V
OUT
=_{⎜⎜⎝⎛}1+
R +R
2
3
R
4
⎟⎟⎠⎞^{×0.85V +}
1
2
IR
RIP ESR
Output
R2
R3
FB
R4
GND
● Power Stand-by Indicator (PSI)
Continuous/Light Load modes are selectable by PSI pin, High or Low. High = continuous mode, Low = light
load mode. LG pin is held Low and stops the operation of Low side FET in the light load mode.
● Output Pull-Down
THV3012 has a built-in Output Pull-Down function to shorten the output fall time. When CTL pin is turned to
Low, an internal transistor connected between CSP pin and GND start to discharge the output capacitor.
● Setting the Oscillation Frequency (FSET)
User can choose Oscillation frequency 360kHz or 500kHz by adjusting the voltage on FSET pin. High =
360kHz(typ), Open = 500kHz(typ).
Copyright©2009 THine Electronics, Inc.
9/12
THine Electronics, Inc.